Excavated-in Harbor Basin Water Flow Characteristics Of3D And The Influence Of Sediment Deposition

The dug-in basin is a common arrangement in the port layout, prevalence of reflux movement reaches the cecum with typical dig-in basin from the mainstream diffusion of sediment into the basin, the basin mouth near the door, and basin siltation, impact the normal operation of the basin. Dug-in basin siltation from the flow characteristics indirect analysis The silting mechanism, due to dig-in basin within the water body of water, sand and mixed-phase fluid, so the only muddy water model to real reaction basin flow characteristics, and also from sediment deposition angle to understand the basin siltation mechanism.Investigated by the use of muddy water physical model three-dimensional flow characteristics of the basin, and further research on the effects of boundary conditions on sediment deposition mechanism on this basis to establish a water-sand two-phase flow model, by turbulent energy and water and sediment mixing phase. The density of the distribution law of the basin sediment deposition, the following conclusions:1) Dig into the basin water movement was a typical three-dimensional characteristics of turbulent intensity point of view, the mixing area of the water turbulence intensity within the basin along the basin axis, decreasing along the way, and posterior wall of the basin near tends to zero. Gradually increase the mixing zone with the flow direction; large area of turbulence intensity in the recirculation zone mainly students and secondary return friction belt; smaller turbulence intensity of the center of main return, the perimeter of the turbulent intensity in the depth direction, turbulence intensity along the depth decreases.2) The main factors to affect the basin flow characteristics is the entrance width of the basin axis and the mainstream angle, the mainstream velocity, the above factors by changing the turbulence intensity of the entrance mixing zone, thereby changing the mixing zone to the recirculation zone the turbulent energy gradient, and ultimately change the flow characteristics of the basin. Basin Entrance width the greater the greater the scope of basin reflux, the greater the turbulence intensity in the larger region; basin axis with greater mainstream angle, the greater the reflux range from the turbulence of the mixing area of the recirculation zone the greater the gradient; mainstream flow rate the greater the mixing zone the greater the turbulence kinetic energy.3) The difference between the sediment-carrying capacity of the basin water bodies inside and outside the basin within the sediment deposition in the extent and distribution range of reasons. Basin sediment deposition is Basin Entrance width is proportional with the increase in the basin axis and the angle of the water deepened, with the mainstream flow rate increases with increasing.